Membrane-forming dope for carbon membranes and a method for producing a carbon hollow fiber membrane using the same
a technology of carbon membrane and dope, which is applied in the direction of dispersed particle separation, chemical instruments and processes, separation processes, etc., can solve the problems of low solvent resistance and heat resistance of organic membranes, high cost and difficulty in molding, and the sulfonated polyphenylene oxide itself is not a versatile material. , to achieve the effect of reducing the cost of producing hollow fiber carbon membranes, improving mass productivity and high functionality
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example 1
[0043]A spinning dope comprising 28 parts by weight of polyphenylene oxide resin (PP0646, produced by SABIC), 0.6 parts by weight of sulfur (produced by Kanto Chemical Co., Inc.), and 71.4 parts by weight of dimethylacetamide was prepared by first dissolving the sulfur in the dimethylacetamide, and then dissolving the polyphenylene oxide resin.
[0044]The prepared spinning dope was heated to 150° C., and extruded into a water coagulation bath using a spinning nozzle having a double tubular structure while using ethylene glycol as a core liquid, and dry-wet spinning was performed at a spinning rate of 15 m / min. Thereafter, the resultant was dried in an oven at 60° C., thereby obtaining a porous polyphenylene oxide hollow fiber membrane having an outer diameter of 1060 μm and an inner diameter of 930 μm. FIGS. 1 and 2 show magnified SEM images of the cross-section of the hollow fiber membrane after spinning and drying.
[0045]Subsequently, the obtained hollow fiber membrane was inserted i...
example 2
[0047]The hollow fiber carbon membrane obtained in Example 1 was subjected to a CVD treatment at 650° C. for 2 minutes in a propylene gas atmosphere. The magnified SEM image of the cross-section of the obtained hollow fiber carbon membrane was the same as that of Example 1 (FIG. 3). Further, the gas permeability test was also conducted on the hollow fiber carbon membrane after the CVD treatment.
example 3
[0052]The spinning dope prepared in Example 1 was heated to 150° C., and extruded into a water coagulation bath using a spinning nozzle having a double tubular structure while using ethylene glycol as a core liquid, and dry-wet spinning was performed at a spinning rate of 15 to 20 m / min. Thereafter, the resultant was wound on a bobbin while drying by blowing hot air of 220° C., thereby obtaining a porous hollow fiber membrane having an outer diameter of 450 μm and an inner diameter of 395 μm.
[0053]Subsequently, while applying a stress of 0.004 MPa, the hollow fiber membrane was subjected to an infusibilization treatment by heating at a temperature of 320° C. for 1 hour in the air. Further, the infusibilized hollow fiber membrane was inserted into a quartz tube, and subjected to a carbonization treatment by heating at a temperature of 700° C. for 45 minutes in a nitrogen atmosphere. Finally, a CVD treatment was performed at a temperature of 700° C. for 5 minutes in a nitrogen and pro...
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